TITLE: GCN CIRCULAR NUMBER: 30355 SUBJECT: GRB 210702A: Swift/UVOT redshift DATE: 21/07/02 23:27:24 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) reports on behalf of the Swift/UVOT team: The Swift/UVOT obtained a 49s grism spectrum of GRB 210702A starting 282 s after the BAT trigger (Lien et al., GCN Circ. 30351). The spectrum shows a clear break at 2011 Angstrom, and absorption features attributable to Ly-alpha and Ly-beta suggesting a redshift of z=1.1757+/-0.0093. An possible intervening system is present at z=1.050 based on a weaker line seen at 2492A. The wavelength anchor/zeropoint in the uv grism is uncertain by typically 15A, which translates to an uncertainty as quoted in the redshift above.